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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94264eab7a9bc15ac902bd5129e89a69c0f65cadf7f7fcf2e240d1f2ece8ebfe' 
  AND token = 'zTITZvzRfJsBu9dSyaxtk8vzzFb0vWa25Q01YryrFVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}